Picture frame back support



FIG. 1 is a top, front and right side perspective view of my new pictureframe back support;

FIG. 2 is a left side elevation;

FIG. 3 is a bottom elevation;

FIG. 4 is a front elevation; and,

FIG. 5 is a rear elevation.

The ornamental design for a picture frame back support, as shown anddescribed.